could someone please be nice to check and help me with some of my math problems.?

Question

thank you. i really tried and some of my answers might be wrong so please look over them and help me with the others. i tried really hard. honest.
1) 2+(3-4) to th second power
over
9-3 is the answer 1 third?
2) x-(yz) to the second power. x is 8, y is -3, z is 4. is the answer -136?
3) -2(4x-9)+5(6x+1) is the answer 13 over 22????
4) solve: 3x+15 = 5x-23 is the answer 19?
5) i have no idea how to do this one? solve for a: a over x-y =b
6) if 3x+2y=12, then y=
7) jane earned 67 points on the last math test. Bill earned 54 points less than twice Jane's scoe. What equation can use to find Bill's score? please explain how you got the answer!
8) this is a proportion: solve for n: n+3 over 4 = n-2 over 5
thank you!

Answer 1

1,2, & 4 are correct.

3 Please reread the question; it should have an equal sign.

5 Simply multiply both sides by: x-y

6 Please reread the question; it should have more info.

7 B = 2J - 54

8 Multiply both sides by 20 to eliminate the fractions.

Answer 2

1. 1/3
2. x - (yz) = 8 - (-3*4)= 20
3. write the entire equation.
4. 19
5. a= bx - by (just cross multiply)
6. y= (-3/2)x +6
7. J= Jane's score= 57, B= Bill's score..
B= 2J - 54
B= 2(57) - 54= 80
You know that jane's score is 57 and that twice jane's score minus 54 is bill's score so just write an equation.
8. -23

Probably the easiest **** ive ever done... haha i'm in calculus you can trust me dawg.

Answer 3

1. correct

2. correct

3. should be 22x+23...then if it has =0 then solve accordingly...otherwise just simplify.
If solving should be -23/22

4. correct

5. a= b(x-y)

6. y= -2/3+6

7. suppose Bill's score is x... x=(2*67)-54 multiply janes score by two then subtract 54

8. n= -23

Answer 4

a million) (2 + (-a million)^2 )/6 = 3/6 = a million/2 2) 8 - ((-3)*(4))^2 = 8 - a hundred and forty four = -136 3) -8x+18+30x+5 = ? 22x +23 = ? i'd desire to be responsive to the x or if it equals 0. If it equals 0, then x=-23/22 4) 3x+15 = 5x -23 -> 38 = 2x -> x = 19 5) b= a / (x-y) fixing for a: a = b* (x-y) 6) 3x+2y=12, then 2y=12-3x, so: y = (12-3x)/2 7) Jane=sixty seven pts bill=2*jane-fifty 4 bill= 2*sixty seven - fifty 4 bill = 80 factors 8) (n+3)/4 = (n-2)/5 5n+15 = 4n - 8 n=-23